Have a look at the EMHASS add-on: An energy management optimization add-on for Home Assistant OS and supervised
It works great in a dynamic pricing/ solar production environment.
Here is are charts for today, battery charging/ discharging is the green shade, grid is the red shade:
Even though the price is extremely low currently (3¢/ kWh), it sees what my future household load as well as solar production figures are and then calculated the minimum I need to charge from the grid.
You can see the detailed calculations here:
It only needs to import 7.1 kWh from the grid to fill my (43 kWh) battery. As a bonus it also calculated the optimal is to export to the grid tonight 37 kWh, when the feed in price shoots up over $10/ kWh for a credit of over $200.
Update: the EV had just come home and plugged in so the optimisation schedule has updated and it is now charging from the grid at the cheap prices. The optimisation is recalculated every minute.
